You have a force one yeah? Or you make it?
If you have a force one, and cant do a proper GHR..
Start with your knees of the support pad, just resting your quads on the pad. Have the feet pads as low as possible. This is the easiest level to start from.
Kneel erect, with backs of hands on hamstrings.
Lower until legs lock out straight, pull back with hammys, making sure you dont break at the hips.
Once you can get 3x12 out, bring your knees forward onto the pad. start back at 3x5>3x8>3x10>3x12 then bring the feet rest up 2/3 of the way.
Repeat this process until the feet are at the top.
Once at the top, and got 3x12, drop the foot pad to the bottom, and bring the the whole back plate 1 hole closer. The higher your knees on the pad, the harder it will be.